add github bug report and feature request templates

Author: dan-v

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+### Prerequisites
+
+* [ ] I am running the [latest version](https://github.com/dan-v/awslambdaproxy/releases) of awslambdaproxy
+* [ ] I am have read the [README](https://github.com/dan-v/awslambdaproxy#usage) instructions and the [FAQ](https://github.com/dan-v/awslambdaproxy#faq)
+
+### Description
+
+[Description of the issue]
+
+### Steps to Reproduce
+
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+**Expected behavior:** [What you expected to happen]
+
+**Actual behavior:** [What actually happened]
+
+### Environment
+* If you are using CLI, get the version and specify the full command you are using.
+```
+./awslambdaproxy version
+awslambdaproxy version 0.0.12
+./awslambdaproxy -r us-west-2,us-west-1 -f 60
+```
+* If you are using Docker, get the version and specify the full command you are using.
+```
+docker run -it --rm --entrypoint /app/awslambdaproxy vdan/awslambdaproxy -v
+awslambdaproxy version 0.0.12
+docker run -d vdan/awslambdaproxy -r us-west-2,us-west-1 -f 60
+```
+
+### Error Output
+```
+...
+```

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.